How to use the @sentry/core.Integrations.FunctionToString function in @sentry/core

import { getCurrentHub, initAndBind, Integrations as CoreIntegrations } from '@sentry/core';
import { getMainCarrier, setHubOnCarrier } from '@sentry/hub';
import { getGlobalObject } from '@sentry/utils';
import * as domain from 'domain';

import { NodeOptions } from './backend';
import { NodeClient } from './client';
import { Console, Http, LinkedErrors, OnUncaughtException, OnUnhandledRejection } from './integrations';

export const defaultIntegrations = [
  // Common
  new CoreIntegrations.InboundFilters(),
  new CoreIntegrations.FunctionToString(),
  // Native Wrappers
  new Console(),
  new Http(),
  // Global Handlers
  new OnUncaughtException(),
  new OnUnhandledRejection(),
  // Misc
  new LinkedErrors(),
];

/**
 * The Sentry Node SDK Client.
 *
 * To use this SDK, call the {@link init} function as early as possible in the
 * main entry module. To set context information or send manual events, use the
 * provided methods.

import { getCurrentHub, initAndBind, Integrations as CoreIntegrations } from '@sentry/core';
import { getGlobalObject } from '@sentry/utils';

import { BrowserOptions } from './backend';
import { BrowserClient, ReportDialogOptions } from './client';
import { verifyRequiredBrowserAPIs, wrap as internalWrap } from './helpers';
import { Breadcrumbs, GlobalHandlers, LinkedErrors, TryCatch, UserAgent } from './integrations';

export const defaultIntegrations = [
  new CoreIntegrations.InboundFilters(),
  new CoreIntegrations.FunctionToString(),
  new TryCatch(),
  new Breadcrumbs(),
  new GlobalHandlers(),
  new LinkedErrors(),
  new UserAgent(),
];

/**
 * The Sentry Browser SDK Client.
 *
 * To use this SDK, call the {@link init} function as early as possible when
 * loading the web page. To set context information or send manual events, use
 * the provided methods.
 *
 * @example
 *